Effect of self solidification on mechanical properties of incineration residue from manicipal solid waste.

日本城市垃圾填埋场的剩余寿命逐年下降。填埋固体废物的主要成分是底灰、飞灰等焚烧残渣。另一方面，自然聚集体被耗尽。因此，应对固体废弃物进行再利用和资源化，以延长填埋场的使用寿命，防止环境恶化。由于底灰的化学和矿物学特性随时间变化，焚烧残渣是不稳定的。因此，必须明确底灰的力学特性随时间的变化，以便有效地利用。通过无侧限压缩试验、三轴剪切试验和不排水循环剪切试验，研究了含水量对长期风化底灰强度和变形特性的影响。将底灰在3种不同的条件下固化，（1）湿态，（2）浸没 ...更多信息 艾德条件，和（3）特定时间段的暴露条件。根据土力学试验（JGS）测定了底灰的力学特性。重点讨论了底灰作为建筑材料的地基条件和固化期，主要研究结果如下：（1）通过压实试验、CBR试验表明，底灰作为地基材料可以得到有效的利用。(2)在暴露和湿养护中，无侧限抗压强度随着经过天数的增加而增加。这个原因似乎是试样的自固化。不同养护方式的底灰自凝特性不同。3）在低围压条件下，养护方式对底灰强度和变形特性的影响表现在三轴剪切试验中。但在高围压下，试件的强度下降，无论采用何种养护方法，试件都出现收缩现象，说明随着围压的增加，试件的自凝现象消失。(4)底灰的循环强度受养护方式和养护时间的影响。在底灰吹填的情况下，吹填场地需要采取防止地震液化的措施。少

The remaining life of the municipal waste landfill decreases year by year in Japan. The main component of landfilled solid waste is the incineration residue such as bottom ash and fly ash. On the other hand, the natural aggregates get exhausted. Therefore, the solid wastes should be reused and recycled to prolong the life oflandfill site and to prevent the environmental degradation. Incineration residue is unstable since the chemical and mineralogical characteristics of bottom ash changes with time. Therefore, the mechanical characteristic of bottom ash with time must be clarified for a effective utilization. In this study, a series of soil tests such as uncon-fined compression tests, triaxial shear tests, and undrained cyclic shear tests were carried out to in-vestigate the effect of water content on the strength and deformation characteristics of bottom ash which were weathered for a long period. The bottom ashes were cured under 3 different conditions, (1) wet condition, (2) submerg … More ed condition, and (3) exposure condition for a specific period. The mechanical characteristic of bottom ash was determined in accordance with the soil mechanics test (JGS). The focus point of the discussion was on the ground conditions and the curring period of bottom ash when used as construction materials.The main results of these experimental researches were follows ;(1) It is indicated that the bottom ash can be utilized effectively from the result of compaction, CBR test as a ground material.(2) In exposure and wet curing, the unconfined compressive strength increases with increasing elapsed days. This reason seems to be the self-solidification of the specimen. The self-solidification is different depending on the curing method.3) In the triaxial shear test, low confining pressure, the effect of the curing method appeared in strength and deformation characteristic of bottom ash. However, the strength of specimen deceases at high confining pressure, and the contraction behavior appears regardless of the curing methotl It also clarified that the self-solidification in the specimen disappeared with the increase in the confining pressure.(4) The cyclic strengths of the bottom ash is influenced by curing method and elapsed time. In the case of the reclamation by bottom ash, the reclamation ground needs to take measure against liquefaction during the earthquake. Less